Modifier for light projectors



Oct. 22, 1929. F, 0, L U 5r L, I 1,732,669

MODIFIER FOR LIGHT PROJEGTORS Filed Aug. 8. 1927 3 Sheets-Sheet 1 ,rmn

Oct. '22, 1929. I Q UNGLAUB ET AL 1,732,669

MODIFIER FOR LIGHT PROJECTORS Filed Aug. 8. 1927 3 Sheets-Sheet 2 r r jZ I TZ J6 7 amen (0&3 5; dau zwi M15 312M300 I F. O. UNGLAUB ET ALMODIFIER FOR LIGHT PROJECTORS Oct. 22, 1929;

\ Filed An us; 1927 3 Sheets-Sheet C5 gm vanish 5270; 44. M

1,732,6lid

rear

FELIX O. UNGLAUB, OF ALDAN, AND JDHANN C. SCIIMID, 0F PHILADJEL'P:

SYLVANIA MODIFIER FORLIGHT PROJEUTOES Application filed August 8, 1327.Serial No. 211,535.

'lihis invention relates to light projectors, particularly to a devicefor use with such i ectors whereby the beam of light pro ed thereby maybe so inodiiied as to eliminate glare without reducing the intensity ofthe beam or the distance to which it may be projected.

The device o'lj' our invention is designed n'iinarily for use inconnection with the headli 'hts oi? motor vehicles, but obviously, dueto its advantageous influence upon the projected bean: olfi light issuitable for use in connection with searchligh ts, beacons, iloodlightssuch as are used for lighting aviation iai'lding iields or aerodroines,and in other installations where a light of high intensity andpenetration but non-glaring, is desirable.

The object of the invention is to produce a device having means wherebythe glaring rays oi the beam of light may be eliminated, but which atthe same time produces a beam of: light free of blind spots or otherundesirable characteristics.

The invention consists in a modifier for light projectors, compr 1gmeans arranged in the path oi the light rays proceeding directly fromthe source of light and functioning; to prevent the direct projectionof? such rays, and means flanking such first mentioned means and soarranged to re i'lect light rays thereupon and to prevent undue lateraldiil'usion oi the projected beam of light, combined, if desired, withmeans tor obstructing projection of those rays of i' it which arereflected from the upper portion oi the reflector of the lightprojector, as we will proceed new to explain and finally claiin.

1n the accompanying drawings illustrating the invention, in the severalfigures of which like parts are similarly designated, l isure 1 is a -lront elevation of the device 0t our invention. 2 is a side or edge viewthereof. l 3 is a top view. 4t a transverse ion tahen substantially onthe line l-& of Fig. 1. Fig. 5 is perspective view of an attachingdevice. Fig. 6 is a fraginentary perspective view of one of theattaching devices in position to hold the modifier upon the lens orglass front of the projector. Fig. 'i is a din 'rannnatic sec ional.view on line l l of ldig. 1, showi the device of the inventionassociated with the ordinary paraboac reflector and illustrating the oil.t elf the device upon the rays oi light.

Fig. 8 a diagrannnatic sectional view Fig. but taken on line 8-8 oi sshown in Figs. 1. to i, the device coinate 1 sl'aped to conform to theto the headlight or other projector 'ch is used, usually circular, and

ed and bent as to form pairs of vanes and 4t, arranged vertically of andat ap n'opr e angles to the plate 1, as c5 will be later described, andso shaped and proportioned as to best suit them for the purposes :iorwhich they are designed.

Arranged centrally, vertically oi the plate 1, and connected thereto asby rivets 5, an obstruct-or member 5 fornizd oi a piece oi? sheetmaterial bent upon itself, as show and provided with a ll-shapcd portionwhich is arranged to lie directly in liront of the source of light andintercept or obst the passage of rays ol light proceeuugi directlyriorwardly troin the source oi? its shown in liig. 1, the upper per. theplate 1 is left intact to form a {T1 s iield 8 which will intercept rayst light reliected from the upper portion of the reflector oi theprojector.

Owing to the light modifying properties o1 our device it may be usedwith a front oi? ordinary window or plate glass, and may be mounted inthe projector or heath light by attaching it to such glass. For thispurpose we provide the plate 1 with a plurality oi suitably locatedslots 9 adjacent to its periphery, and engage with these tangg's 1.0 ofattaching devices such as shown in Figs. 5 and 6, same being bent up asshown in dotted lines (llig. 5.) These attaching devices have luvs 11which are bent over the edge or the glass 12 (Fig. 6). Obviously aflector 14) and fallin upon the reflector 1%,

will be projected between the vanes 2, 3 and l and the members 6 and 7.Several of such rays are indicated by the letter a.

Other rays light, such as that indie; ted by b, which fall upon thevanes 2, will be reflected therefrom upon the member 7, the relativeangles of the vanes and member T being such that these rays will beagain reflected from the member 7 as indicated at c in sulstantialparallelism with the rays reflected from reflector 14c. In order that tlis reflection of rays from vanes 2 to member 7 may take place, the vanes3 stand away from the plate 1 less than do the vanes 2, and the vanes 4less than the vanes 3.

Other rays of light, such as that indicated by (Z, which fall upon thevanes 4 will be refiected therefrom upon the member 7, and thenceforwardly in the beam.

It will thus be seen that although the ii-shaped member 7 obstructs orintercepts rays of light proceeding directly from the source, it isilluminated by light reflect-ed from the vanes 2, 3 and 4 and in turnreflects this light into the beam of the projector, thus eliminating anyblind spot or shadow in the beam which would be present were it not soilluminated.

Those rays of light, such as e, which fall upon the vanes 2, 3 and 4:are reflected back and forth between the surfaces of these vanes untilthey pass them and are projected in a diffused glow to the sides of theprojector. This latter is important in automobile headlights for thereason that a certain amount of lateral illumination is required by lawto light the sides of the road.

Those rays of light, such as g, which are projected upon the innerreflecting surfaces of the V-shaped member 7 will be reflected upon thereflector i land thence reflected will join the beam.

Referring now to Fig. 8, it will be seen that all of those rays oflight, such as 7b, which fall upon the reflector and do not, afterrcflection, strike the members 2, 3, 4c, 6, 7 and 8 will be projected inparallelism in a beam from the headlight or projector. Those rays whichdo strike upon the members mentioned will be reflected therefrom, eitherback against the reflector 14 and thence again forwardly, or between'themembers.

Those rays, such as 2', which proceed directly from the source of lightwill strike the member 7 and be thereby reflected against the reflector14, but cannot proceed directly outwardly in a glaring beam.

Rays, such as 70, which, proceeding upwardly, clear the top of member 7will be so apart from the projected beam of parallel rays as not toglare, and those, such as Z, which proceed downwardly will produce noglare.

If desired, we may provide a shield 15 (Fig. 8) which extends in a curveover the tops of the vanes 2, 3 and 4-, and any rays, such as m, whichstrike this shield will be reflceted therefrom downwardly, as indicated.

it will thus be seen that, by the provision of the various members ofour modilier, we produce a luminous beam composed wholly of reflected,intense light, free of glare.

In practice it has been found that with our device in use a lamp orlight source of high candle power may be used without producing aglaring light.

Various changes and modifications in the device to aoapt it to specificinstallations are contemplated as within the spirit of the invention andthe scope of the following claims.

il hat we claim is 1. he con'ihination with a light projector having asource of light and a reflector, of a light modifier comprising a plateadapted to be positioned in front of said reflector and light source andprovided with a V-shaped obstructor member arranged vertically in thepath of rays of light proceeding directly from said source and havingits concave surface facing said source, and a plurality of verticalreflecting vanes flanking said obstruetor member and arranged at variousangles relatively thereto, said vanes being adapted to reflect upon theouter surface of said obstructor member rays of light falling upon them,whereby such rays may be reflected from said obstructor member into theprojected beam of light.

2. A modifier for light projectors, comprising a plate provided with asubstzmtially centrally and vertically arranged V-shapcd obstructormember having inner and outer reflecting surfaces, and a plurality ofvertical reflecting vanes flanking said member at both sides andstanding away from said plate at various angles, said vanes being ofvarious widths, whereby light falling upon them will be reflected uponsaid obstructor member.

In testimony whereof we have hereunto set our hands this 5th day ofAugust, A. D. 1927.

FELIX O. UNGLAUB. JOHANN C. SCHMID.

